starting to implement breit for qvec
compute dffull with breit within the active space; more to come.
qvec with breit runs, but has not been checked for accuracy
Merge branch 'master' of https://github.com/shiozaki/BAGEL

# By Toru Shiozaki
# Via Toru Shiozaki
* 'master' of https://github.com/shiozaki/BAGEL:
  cosmetic changes - includes slight changes in the CAS interface
CASBFGS now works without active orbitals (useful in debugging other things)